linux-kernel - Re: [PATCH 4.14 023/159] mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM

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Date:   Mon, 8 Jan 2018 20:46:53 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Mike Galbraith <efault@....de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Borislav Petkov <bp@...e.de>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, linux-mm@...ck.org
Subject: Re: [PATCH 4.14 023/159] mm/sparsemem: Allocate mem_section at
 runtime for CONFIG_SPARSEMEM_EXTREME=y

On Mon, Jan 08, 2018 at 04:04:44PM +0000, Ingo Molnar wrote:
> 
> hi Kirill,
> 
> As Mike reported it below, your 5-level paging related upstream commit 
> 83e3c48729d9 and all its followup fixes:
> 
>  83e3c48729d9: mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y
>  629a359bdb0e: mm/sparsemem: Fix ARM64 boot crash when CONFIG_SPARSEMEM_EXTREME=y
>  d09cfbbfa0f7: mm/sparse.c: wrong allocation for mem_section
> 
> ... still breaks kexec - and that now regresses -stable as well.
> 
> Given that 5-level paging now syntactically depends on having this commit, if we 
> fully revert this then we'll have to disable 5-level paging as well.

Urghh.. Sorry about this.

I'm on vacation right now. Give me a day to sort this out.

-- 
 Kirill A. Shutemov